Waterproof NTC temperature measuring device

Abstract

A waterproof NTC temperature measuring device disclosed by the present invention comprises a body, a buckle and a wire harness, the body is internally provided with an installation chamber, the middle part of the upper end of the body is provided with an insertion groove, the lower end of the insertion groove is communicated with the installation chamber, a lead wire guider is inserted in the insertion groove, the lead wire guider is connected with the body through a sealant, and the wire harness is internally provided with a lead wire. The wire extends into the mounting chamber and then is connected with the NTC element, the lower end of the body is connected with a temperature sensing metal cap in a sealed mode, the NTC element is located in the temperature sensing metal cap, and the buckle comprises a clamping plate, a vertical plate and a C-shaped plate which are sequentially connected. According to the waterproof NTC temperature measuring device, the waterproof performance can be effectively improved, the NTC temperature measuring device can adapt to a long-term vibration use environment, the service life of the NTC temperature measuring device is prolonged, and the temperature measuring precision of the NTC temperature measuring device is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of NTC temperature measuring devices, and in particular relates to a waterproof NTC temperature measuring device. Background Art

[0002] NTC temperature measuring device is a thermistor and probe. Its principle is that the resistance value decreases rapidly as the temperature rises. NTC temperature measuring device is generally assembled by NTC element (NTC thermistor), probe and wire. In the automotive industry, NTC temperature measuring device is often used to measure the temperature of coolant. In order to maintain fixed contact with the measured pipeline, a buckle is also set on the body of NTC temperature measuring device. Since the body is close to the pipeline, once there is water seepage on the pipeline, it is easy to penetrate into the inside of NTC temperature measuring device, causing the NTC temperature measuring device to fail. At the same time, since the car is often in a driving state, the pipeline will shake for a long time, which can easily cause the buckle to loosen, causing the probe to be sent to the contact position of the pipeline, affecting the accuracy of temperature measurement. Summary of the invention

[0003] In order to solve the above technical problems, the technical solution adopted by the present invention is: a waterproof NTC temperature measuring device, including a body, a buckle and a wiring harness, the body has an installation chamber inside, the middle part of the upper end of the body has a plug-in slot, the lower end of the plug-in slot is connected to the installation chamber, a lead guide is plugged into the plug-in slot, the lead guide and the body are connected by a sealant, the middle part of the lead guide and the wiring harness are integrally injection molded, a wire is provided inside the wiring harness, the wire is extended into the installation chamber and then connected to the NTC element, the lower end of the body is sealed and connected to a temperature-sensitive metal cap, the NTC element is located inside the temperature-sensitive metal cap, the buckle includes a snap-in plate, a vertical plate and a C-shaped plate connected in sequence, a clamping groove is provided on the clamping plate, a plug-in portion is formed on both sides of the clamping groove, slots for inserting the plug-in portion are provided on both sides of the body, the body is located in the clamping groove and is integrally injection molded with the snap-in plate, and a curved portion is provided at the upper end of the vertical plate which is recessed toward one side of the body.

[0004] As a preferred embodiment of the above technical solution, the lead guide includes a tapered portion and a partition portion from top to bottom, the tapered portion is inserted into the plug-in slot, the wires inside the wiring harness are divided into positive wires and negative wires, and the partition portion is located between the positive wires and the negative wires.

[0005] As a preferred embodiment of the above technical solution, the inner diameter of the lower end of the plug-in slot is larger than the inner diameter of the upper end of the installation chamber, and an annular groove is provided at the lower end of the plug-in slot.

[0006] As a preferred embodiment of the above technical solution, sliding bars are respectively provided on both sides of the conical portion, and glue injection grooves are respectively provided on both sides of the plug-in groove, the width of the glue injection groove gradually decreases from top to bottom, the sliding bars are inserted into the glue injection groove, and the lower end of the glue injection groove is located above the annular groove.

[0007] As a preferred embodiment of the above technical solution, a plurality of protrusions are provided on the circumferential surface of the conical portion, and a plurality of slots for the protrusions to be inserted into are provided on the plug-in slot.

[0008] As a preferred embodiment of the above technical solution, the sealant is a thermally conductive sealant.

[0009] As a preferred embodiment of the above technical solution, the vertical plate and the C-shaped plate are respectively provided with hollow parts.

[0010] As a preferred embodiment of the above technical solution, the buckle is integrally formed of metal.

[0011] As a preferred embodiment of the above technical solution, the main body and the temperature-sensitive metal cap are integrally injection-molded.

[0012] The beneficial effects of the present invention are as follows: the waterproof NTC temperature measuring device of the present invention can effectively improve the waterproof performance, improve the adaptability of the NTC temperature measuring device to the use environment of long-term vibration, and improve the service life and temperature measurement accuracy of the NTC temperature measuring device. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the present invention;

[0014] Figure 2 It is a schematic diagram of the cross-sectional structure of the main body;

[0015] Figure 3 It is a schematic diagram of the cross-sectional structure of the main body at another angle;

[0016] Figure 4 It is a schematic diagram of the cross-sectional structure of the clamping plate. DETAILED DESCRIPTION

[0017] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0019] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] like Figure 1-4 As shown, the waterproof NTC temperature measuring device includes a body 1, a buckle and a wiring harness 2, wherein the body 1 has an installation chamber 3 inside, a plug-in slot 4 is provided at the middle part of the upper end of the body 1, the lower end of the plug-in slot 4 is connected to the installation chamber 3, a lead guide is plugged into the plug-in slot 4, the lead guide is connected to the body 1 by a sealant, the middle part of the lead guide is integrally injection-molded with the wiring harness 2, a wire is provided inside the wiring harness 2, and the wire is extended into the installation chamber 3 and then connected to the NTC element 5, a temperature-sensitive metal cap 6 is sealed and connected to the lower end of the body 1, and the NTC element 5 is located inside the temperature-sensitive metal cap 6, the buckle includes a clamping plate 7, a vertical plate 8 and a C-shaped plate 9 connected in sequence, a clamping slot 10 is provided on the clamping plate 7, a plug-in portion 11 is formed on both sides of the clamping slot 10, and slots 13 for inserting the plug-in portion 11 are provided on both sides of the body, the body 1 is located in the clamping slot 10 and is integrally injection-molded with the clamping plate 7, and a bending portion 30 is provided at the upper end of the vertical plate 8 which is recessed toward one side of the body 1. The curved portion 30 increases the elasticity of the buckle and reduces the impact force on the body 1 during the vibration of the vehicle. The lead guide can ensure that the assembled wire harness 2 is located in the middle of the body 1, reducing the tilt of the center of gravity of the NTC temperature measuring device caused by the wire harness 2 not being centered, thereby causing the NTC temperature measuring device to tilt and affect the measurement effect.

[0021] Furthermore, the lead guide includes a tapered portion 15 and a separator 16 from top to bottom, the tapered portion 15 is inserted into the plug-in slot 4, the wires inside the wiring harness 2 are divided into a positive wire 17 and a negative wire 18, and the separator 16 is located between the positive wire 17 and the negative wire 18. The separator 16 prevents the positive wire 17 and the negative wire 18 from short-circuiting due to shaking. The tapered portion 15 is conducive to the installation of the lead guide, improves the centering of the lead guide, and ensures that the wiring harness 2 can accurately pass through the middle of the body 1. In this way, the NTC temperature measuring device is stably and evenly stressed after installation, preventing the NTC temperature measuring device from tilting due to the oblique pulling force generated by the non-centering of the wiring harness 2 in the long-term vibration environment of the car, thereby ensuring that the NTC temperature measuring device can accurately measure the temperature.

[0022] Furthermore, the inner diameter of the lower end of the plug-in slot 4 is larger than the inner diameter of the upper end of the installation chamber 3 , and an annular groove 19 is provided at the lower end of the plug-in slot 4 .

[0023] Furthermore, slide bars 20 are provided on both sides of the conical portion 15, and glue injection grooves 21 are provided on both sides of the plug-in slot 4. The width of the glue injection groove 21 gradually decreases from top to bottom. The slide bar 20 is inserted into the glue injection groove 21, and the lower end of the glue injection groove 21 is located above the annular groove 19. Before installing the wiring harness 2 and the lead guide, first apply sealant to the inner wall of the plug-in slot 4, insert the lead guide into a part of the plug-in slot 4, and then inject sealant into the lower end of the glue injection groove 21, and then fill the glue injection groove 21 from bottom to top. Finally, tighten the lead guide. In this way, the sealant can fill the gap between the lead guide and the body 1. Excess glue can enter the annular groove 19. Due to the design of the glue injection groove 21 and the annular groove 19, the path for water to enter the contact wire or the NTC element 5 inside the body 1 is extended, and the possibility of water entering the NTC temperature measuring device and affecting the temperature measurement effect is further reduced.

[0024] Furthermore, a plurality of protrusions 22 are provided on the circumference of the conical portion 15, and a plurality of slots 23 are provided on the plug-in slot 4 for the protrusions 22 to be inserted into. The protrusions 22 and the slots 23 are used to position the wire harness 2 and the lead guide when they are installed, preventing the lead guide from extending into the body 1. The bonding strength between the lead guide and the body 1 is improved during use, and the wire harness 2 can share the tension when it is pulled, preventing the lead guide bonded by the sealant from being easily pulled off by the tension.

[0025] Furthermore, the sealant is a heat-conducting sealant, which has good thermal conductivity and can prevent the body 1 and the lead guide from being separated from each other due to uneven heating, resulting in different degrees of shrinkage and expansion.

[0026] Furthermore, the vertical plate 8 and the C-shaped plate 9 are respectively provided with a hollow portion 24. The hollow portion 24 reduces the weight of the buckle and improves the elasticity of the buckle.

[0027] Furthermore, the buckle is integrally formed of metal. The NTC temperature measuring device is fixed on the pipeline that needs to be temperature measured by the buckle, and the metal buckle has a long service life and is resistant to aging.

[0028] Furthermore, the body 1 and the temperature-sensitive metal cap 6 are integrally injection-molded. The integrally injection-molded body 1 and the temperature-sensitive metal cap 6 improve the sealing of the connection. The temperature-sensitive metal cap 6 is generally made of copper with good thermal conductivity.

[0029] It is worth mentioning that the technical features such as NTC components involved in the patent application of this invention should be regarded as prior art. The specific structure, working principle and possible control method and spatial layout method of these technical features can be selected by conventional methods in the field, and should not be regarded as the inventive point of the patent of this invention. The patent of this invention will not be further elaborated.

[0030] The preferred specific embodiments of the present invention are described in detail above. It should be understood that ordinary technicians in this field can make many modifications and changes based on the concept of the present invention without creative work. Therefore, all technical solutions that can be obtained by technicians in this technical field through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the existing technology should be within the scope of protection determined by the claims.

Claims

1. Waterproof NTC temperature measuring device, characterized in that, The utility model comprises a main body, a buckle and a wiring harness, wherein the main body has an installation chamber inside, a plug-in slot is provided at the middle part of the upper end of the main body, the lower end of the plug-in slot is connected to the installation chamber, a lead guide is plugged into the plug-in slot, the lead guide is connected to the main body by a sealant, the middle part of the lead guide and the wiring harness are integrally injection-molded, a wire is provided inside the wiring harness, the wire is extended into the installation chamber and then connected to an NTC element, a temperature-sensitive metal cap is sealed and connected at the lower end of the main body, the NTC element is located inside the temperature-sensitive metal cap, the buckle comprises a clamping plate, a vertical plate and a C-shaped plate connected in sequence, a clamping slot is provided on the clamping plate, a plug-in portion is formed on both sides of the clamping slot, slots for inserting the plug-in portion are provided on both sides of the main body, the main body is located in the clamping slot and is integrally injection-molded with the clamping plate, and a curved portion is provided at the upper end of the vertical plate which is concave toward one side of the main body.

2. The waterproof NTC temperature measuring device according to claim 1, characterized in that: The lead guide includes a tapered portion and a separator from top to bottom, the tapered portion is inserted into the plug-in slot, the wires inside the wiring harness are divided into positive wires and negative wires, and the separator is located between the positive wires and the negative wires.

3. The waterproof NTC temperature measuring device according to claim 2, characterized in that: The inner diameter of the lower end of the plug-in slot is larger than the inner diameter of the upper end of the installation chamber, and an annular groove is arranged at the lower end of the plug-in slot.

4. The waterproof NTC temperature measuring device according to claim 3, characterized in that: Slide bars are respectively arranged on both sides of the conical part, and glue injection grooves are respectively arranged on both sides of the plug-in groove. The width of the glue injection grooves gradually decreases from top to bottom. The slide bars are inserted into the glue injection grooves, and the lower ends of the glue injection grooves are located above the annular grooves.

5. The waterproof NTC temperature measuring device according to claim 4, characterized in that: A plurality of protrusions are arranged on the circumferential surface of the conical portion, and a plurality of slots for the protrusions to be inserted into are arranged on the inserting slot.

6. The waterproof NTC temperature measuring device according to claim 1, characterized in that: The sealant is a heat-conducting sealant.

7. The waterproof NTC temperature measuring device according to claim 1, characterized in that: The vertical plate and the C-shaped plate are respectively provided with hollow parts.

8. The waterproof NTC temperature measuring device according to claim 7, characterized in that: The buckle is integrally formed of metal.

9. The waterproof NTC temperature measuring device according to claim 1, characterized in that: The body and the temperature-sensitive metal cap are integrally injection-molded.

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